investigators want to know the cause of a firey car crash that killed paul walker over the weekend. the actors publicist says walker's friend was driving the poor ere power -- driving the porshe. it crashed into a tree and burst into flames. >> he's a family oriented kind of guy. really humble. sweet guy. everyone loves the movies. its just devastating. >> and he was well known as a nice guy. investigators say speed was a factor in this crash. a yellow honda sports car was seen parked near the crash site. the speculation it may have been racing the porshe but authorities haven't confirmed that yet. paul walker was in the area to attend a charity event for victims of the typhoon in the philippines. actor ty's gibb son there overcome with tears. he costarred with walker in the fast and furious movies. he went to the crash site yesterday. he placed a single rose at the site. and also took home a piece of the wreckage and later posted a photo of it online. >>> federal investigators will examine a new york commuters train data recorder to try to determine what caused it to derail killing